Yes, Loosescrews does have a few chainrings in 50-tooth, 94 BCD. All silver though.

I did a search and there have been posts in the past about anodized rings. So might as well share what I found out:

I checked out Profile Racing and they indeed list 94 mm chainrings in red, blue, black, and silver on their site. Not sure they are actually in stock though. But no green or yellow.

I looked into do-it-yourself anodizing, but the kit costs $114 and you have to mess with different solution temperatures and settings on the battery charger. Plus the dyes only come in certain colors (the green was too dark).

You can indeed anodize Ti, and there is somebody over the web who can do it. But it comes out mottled so it's recommended for large areas for best effect. Plus no 50-tooth rings in 94 BCD, and I'm not interested in dropping that much money on rings anyway.

I think I will opt for Chicken Cycles UK chainrings. They have 50/36 for 94 BCD. What I like about their black rings is the teeth remain silver so the effect is pleasing. I think two of their silver/black rings will go well with the red/gold/blue of my Kooka. Moreover, you won't see the ugly wear patterns you'd get on fully anodized rings. Problem is they are the distributor so I'd have to get them from an LBS in the UK, via international shipping.